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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fcab5cf515f4ee3c2684114fcd811c29872e09c2f2c989a485e375084f8ec5' 
  AND token = 'fEx4L2rCiSqOoIG/RiYPXUOa0gUPxdrb4GU2G7pNDg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}